20719405

素因数分解:

$5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{4451}}^1$

素因数の和:4489

約数の個数: 24

約数和(自身を含む): 30451680

約数和(自身を除く): 9732275

約数列:

[1, 5, 7, 19, 35, 49, 95, 133, 245, 665, 931, 4451, 4655, 22255, 31157, 84569, 155785, 218099, 422845, 591983, 1090495, 2959915, 4143881, 20719405]

約数ペア:

[(1, 20719405), (5, 4143881), (7, 2959915), (19, 1090495), (35, 591983), (49, 422845), (95, 218099), (133, 155785), (245, 84569), (665, 31157), (931, 22255), (4451, 4655)]